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return index_ptr to inside index

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add max_size
disallow reserved headers after index


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@17727 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
ods15 2006-03-04 16:30:25 +00:00
parent 9ff365af34
commit 0a163ed4e4
1 changed files with 21 additions and 10 deletions
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31
DOCS/tech/mpcf.txt
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@ -166,6 +166,7 @@ stream_header:
time_base_denom v
msb_pts_shift v
max_pts_distance v
max_size v
decode_delay v
reserved u(7)
fixed_fps u(1)
@ -246,6 +247,8 @@ index:
}
}
}
last 8 reserved_bytes of index:
index_ptr u(64)
info_packet:
stream_id_plus1 v
@ -288,7 +291,7 @@ syncpoint:
file:
file_id_string
while(bytes_left > 8){
while(!eof){
if(next_byte == 'N'){
startcode f(64)
forward_ptr v
@ -304,7 +307,6 @@ file:
}else
frame
}
index_ptr u(64)
the structure of a undamaged file should look like the following, but
demuxers should be flexible and be able to deal with damaged headers so the
@ -331,7 +333,7 @@ reserved_headers
file:
file_id_string
while(bytes_left > 8){
while(!eof){
packet_header, main_header, packet_footer
reserved_headers
for(i=0; i<stream_count; i++){
@ -342,11 +344,10 @@ file:
packet_header, info_packet, packet_footer
reserved_headers
}
while(next_code == index_startcode){
if(next_code == index_startcode){
packet_header, index_packet, packet_footer
reserved_headers
}
if (bytes_left > 8) while(next_code != main_startcode){
if (!eof) while(next_code != main_startcode){
if(next_code == syncpoint_startcode){
packet_header, syncpoint, packet_footer
}
@ -354,7 +355,6 @@ file:
reserved_headers
}
}
index_ptr u(64)
Tag description:
@ -407,6 +407,11 @@ max_pts_distance
Note that last_pts is not necessarily the pts of the last frame
on the same stream, as it is altered by syncpoint timestamps.
max_size
max frame size without a checksum after the frameheader.
MUST be <=4*max_distance. If stored value is bigger than max_size MUST
be set to 4*max_distance .
stream_id
Stream identifier
stream_id MUST be < stream_count
@ -507,7 +512,7 @@ flags[frame_code], frame_flags
end presentation time of the final frame.
An EOR set stream is unset by the first content frames.
EOR can only be unset in streams with zero decode_delay .
has_checksum must be set if the frame is larger then 2*max_distance or its
FLAG_CHECKSUM must be set if the frame is larger than max_size or its
pts differs by more then max_pts_distance from the last frame
stream_id_plus1[frame_code]
@ -637,8 +642,12 @@ eor_pts
that EOR. EOR is unset by the first keyframe after it.
index_ptr
absolute location in the file of the first byte of the startcode of the
first index packet, or 0 if there is no index
Length in bytes of the entire index, from the first byte of the
startcode until the last byte of the checksum.
Note: A demuxer can use this to find the index when it is written at
EOF, as index_ptr will always be 12 bytes before the end of file if
there is an index at all.
Info tags:
----------
@ -748,6 +757,8 @@ Index:
Note: with realtime streaming, there is no end, so no index there either
Index MAY only be repeated after main headers.
If an index is written anywhere in the file, it MUST be written at end of
file as well.
Info: